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-55

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Candida Spencer

Lvl 10
3y ago
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Wiki User

12y ago

8 & -7 (see below)

1. x * y = -56

2. x + y = 1

We can rewrite 2. as y = -x + 1

We can then substitute this into 1. to give:

x (-x + 1) = -56

-x2 + x = -56

-x2 + x + 56 = 0

This factors to:

(-x + 8) (x + 7) = 0

Therefore:

-x + 8 = 0

x = 8

and

x + 7 = 0

x = -7

Therefore the two numbers are 8 & -7.

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Q: What numbers multiply to -56 and adds up to 1?
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